This matrix represents the set of hands played, i.e. the hands where, preflop, he made a decision to participate to the game, either by voluntarily pushing chips on the table or by checking as the big blind player.

The heatmap gives a precise idea of the player's starting hands and as the number of hands imported in the database grows, the matrix gets closer and closer to the player's actual range.

Cell coloring is proportional to how often the hand is played when served. Green color means positive EV (Expected Value or average return) while red means negative EV. 

Actual values are reported when hovering.

The table seat and stack and the #players in the hand are taken into account when computing the range.